The Flow of Electrons as Electric Current
Trending Questions
Define electricity
- Zero
- 1.6×10−19 A
- 0.17 A
- 1.07×10−3 A
The potential difference applied to an X-ray tube is 5 kV and the current through it is 3.2 mA. Then the number of electrons striking the target per second is
- 2×1016
- 5×106
- 1×1017
- 4×1015
- 170 C
- 17 C
- 150 C
- 20 C
A steady current flows in a metallic conductor of non uniform cross section .Explain which of these quantities is constant along the conductor and why? :current, current density, electric field and drift speed?
What is Coulomb in physics?
As shown in the figure, a battery of emf ϵ is connected to an inductor L and resistance R in series. The switch is closed at t=0. The total charge that flows from the battery, between t=0 and t=tc (tc is the time constant of the circuit) is
- ϵLR2e
- ϵLR2(1−1e)
- ϵLR2
- ϵReL2
- U2
- U4
- 4U
- 2U
What is the SI unit of surface charge density?
What Is The Basic Three Electrical Quantities?
- 106
- 107
- 1013
- 1019
- 3.14 A
- 11.2 A
- 0.01 A
- 0.112 A
- 9×1012
- 18×1012
- 9×107
- 8×107
The current through a wire depends on time as i = i0+αt, where i0 = 10 A and α=4As−1. Find the charge crossed through a section of the wire in 10 seconds.
- 240 N/C
- 360 N/C
- 420 N/C
- 480 N/C
(14πϵo=9×109 Nm2/C2)
- 6.7×10−7Cm−2
- 6.7×10−5Cm−2
- 6.7×10−4Cm−2
- 6.7×10−8Cm−2
In an electrolyte 3.2× 1018 bivalent positive ions drift to the right per second while 3.6× 1018 monovalent negative ions drift to the left per second. Then the current is
- 1.6 amp to the right
- 1.6 amp to the left
- 0.45 amp to the right
- 0.45 amp to the left
a wire of resistance 18 ohm is bent to form an equilateral triangle. The resistance across any two vertices of the triangle is(in ohm)
Three identical bulbs P, Q and R are connected to a battery as shown in figure. When the circuit is closed
Q and R will be brighter than P
All the bulbs will be equally bright
Q and R will be dimmer than P
Q and R will not shine at all
- μ0Ib4π2R2
- μ0Ib2π2R2
- Zero
- μ0I4π2R2
- Temperature
- charge density
- pressure
- electric potential
For a real battery the work done by battery is equal to increase in electrical potential energy of a positive charge as charge moves from negative terminal to positive terminal of battery
Is this above statement true. ??
- 40loge4
- 30loge3
- 20loge2
- 10loge2
A current flowing through a wire depends on time as. The charge flowing through the cross-section of the wire in time from to is:
i=(10+4t)
Here, i is in ampere and t in seconds. Find the charge crossed through a section in time interval between t=0 to t=10 s.
- 300 C
- 400 C
- 500 C
- 600 C